<ul class="nav nav-pills nav-stacked" id="nav_menu">
    <li class="active"><a href="{{base_url}}admin" >Dashboard</a></li>
    <li><a href="{{base_url}}admin/user.php">Users</a></li>
    <li><a href="{{base_url}}admin/phone.php">Phone</a></li>
    <li><a href="{{base_url}}admin/brand.php">Brand</a></li>
    <li><a href="{{base_url}}admin/accessory.php">Accessory</a></li>
</ul>